Protective device for printing and embossing presses.



M. ROCKSTROH.

P ROTECTIVE DEVICE FOR PRINTING AND EMBOSSING PRESSES.

APPLICAHON FILED APB-10,1914.

l, 169 68U Patented Jan. 25, 1916.

6 SHEETSSHEET I.

THE COLUMBIA PLAHOGRAPH (30., WASHINGTON, D c.

M. ROCKSTROH.

PROTECTIVE DEVICE FOR PRINTING AND EMBOSSING PRESSES. APPLICATION FILED APR. 10, 1914.

Llfigfififl, Patented Jan. 25, 1916.

6 SHEETS-SHEET 2.

THE COLUMBIA PLANOGRAPH 0)., WASHINGTON. D. c.

Llwfimn Patented Jan. 25, 1916.

6 SHEETS-SHEET 3.

THE COLUMBIA PLANOGRAPH c0, WASHINGTON. D c

M. ROCKSTROH.

PROTECTIVE DEVICE FOR PRINTING AND EMBOSSING PRESSES.

APPLICATION FILED APR. 10, 1914.

Lmgfiwn Patented Jan. 25, 1916.

6 SHEETSSHEET 4.

THE COLUMBIA PLANOGRAPH c0.. WASHINGTON, I). c.

M. ROCKSTROH.

PROTECTIVE DEVICE FOR PRINTING AND EMBOSSIN G PRESSES. APPLICATION FILED APR. 10. I914.

1,169,68U, Patented Jan. 25, 1916.

Fig.5

6 SHEETSSHEET 5- Tm: COLUMBIA'PLANOGRAPH co,, WASHINGTON, D. c.

M. ROCKSTROHI PROTECTIVE DEVICE FOR PRINTING AND EMBOSSIIIG PRESSES. APPLICATION FILED APR. I0. IBM.

1,, 169,680,, Patented J an. 25, 1916.

6 SHEETSSHEET 6.

THE COLUMBIA ILANOGRAPH co, WASHINGTON, n. c.

MAX BOGKS'IRO'I-I, OF KLEIN-SEDLITZ, NEAR PIRNA, GERMANY.

PROTECTIVE DEVICE FOR PRINTING AND EMBOSSING PRESSES.

Specification of Letters Patent.

Patented J an. 25, 1916.

Application filed. April 10, 1914. Serial No. 830,859.

Tour/Z2 whom it may concern Be it known that 1, MAX Rocnsrnon, manufacturer, a subject of the King of Sanony, Germany, residing at Klein-Sedlitz, near Pirna, Saxony, Germany, have invented certain new and useful Improvements in Protective Devices for Printing and Embossing Presses, of which the following is a specification.

A My invention relates to protective devices for printing and embossing presses.

Protective devices are already well-known in which a grating which covers the dangerous gap between the platen and table is employed for throwing the machine out of gear, but these guards afford no protection against putting the hands into the rolls.

The present invention which affords the most perfect protection that can be expected of such a devlce provides a sheet-metal plate or grating which covers over the inking rollers and swings up and down in a position approximately parallel to itself; this ar rangement is connected with a number of new effects which are enumerated hereinafter: 1. The hands are protected from the dangerous rotation of the rollers. 2. The protective grating is located in its elevated position when the platen is in its open position and leaves the table perfectly free for the purpose of lifting the form and the platen for the purpose of making the form ready or inserting the sheet of paper. 3. The protective grating in its elevated position is arrested in front of the rollers against movement toward the rear, whereas in its lower position it is able to yield toward the rear and also upward in order entirely to prevent the fingers being jammed between the top edge of the platen and the guard without impairing the reliability of the function of the latter. 4. After the guard has been lowered and the machine has begun to be thrown out of gear in the case of danger, the guard rises at once; the hand still resting on the platen is released from the guard and is not held clamped between the platen and the guard. 5. The hand resting on the platen can never be clamped between the protective bar and the upper edge of the platen as was readily possible heretofore.

Figure 1 is a side view of the device at tached to a press. Fig. 2 is a top plan view of the same. Fig. 8 is a similar view as Fig. 1, with the grate in elevated position. Fig. 4: is a side view of a modified form of the device. Fig. 5 is an end view thereof. Fig. 6 1s a. view similar to Fig. l with the grate at the beginning of its upward movement.

material and of any suitable shape consists,

for example, in the present case of a grating a attached to a frame I) which is pivotally suspended from the ends of the levers 0 fast on the common spindle cl. The guard is steered by means of a cam f, mounted for example on the main gear-wheel 6, through the medium of the anti-friction roller 9 of the lever It and the connectingrod i. The parallel motion of the guard is effected by means of a guide lever comprising two telescopic parts 70 and Z connected by a spring m which allows the guard to yield in the direction of the table.

The operation is such that when the machine is running normally the projection 0 of the frame I) bears on a pin r of the safety levers s, so that the lug p of this lever moves over the arm 9 of the engaging lever t; if the hand of the operator is still resting on the platen, however, the safety lever 8 remains in its disengaging position. The lug 79 bears against the arm 9 and the machine is thrown out of gear and the brake is applied.

Another form of the invention as applied to a high-speed press is shown in Figs. 4 to 9. In these figures a; designates the reciprocating table, and b the protective grating which swings up and down and is suspended from the two levers 0. These levers are fast on a spindle (Z j ournaled in the sides of the frame 6. The guard b is steered by the cam-shaft 7 through the medium of the anti-friction roller g, the lever h and the rod 6. Attached to the table is a rail 7:: adapted to coaet with a friction clutch Z which is connected by the connecting rod or and the rod n with the disengaging rod 0. The clutch Z is so arranged that it can be driven by the rail 70 in only one direction; this is effected by the knee-lever action'with which the upper friction jaw 22 bears against the rail 70. The jaw 79 is moved into its releasing position by the projection q of the guard Z) which bears on the angle lever s on which the jaw 79 is suspended. The action is analogous to that'of the device described above inasmuch as when the machine is working normally the projection q of the guard b bears on the angle lever 8, whereby the friction awy; remains elevated; so that the rail 70 can slide unimpededly th'ro'iigh the clutch. When theguard is in its raised POSiBiOII etal -i moringbackwar n spite of the fri tlOD jaw not being lifted fromthe rail 7a the latter will slide through neverthelessin consequence of the frictionacting in only one direction. If the guard is moved toward the rear in case of danger, forex ample when a hand or some. object is left lying on the table then the friction j aw loses its support, it moves into its frictional position and the machine is thrown out of gear. I n order to accelerate the disengagement of the machine the disengaging rodis connected not only with the flywheel brake, but also by known" means, which need not be described in detail, with the brake of the carriage and cylinder.

Copies of l-l'fpiotective device for printing and embossingpresses comprising in combination, a substantiallyvertical guard grate, in front of the inking rollers of the press, means for raising said grate and holdingv it in its elevated position against rearward movement, and means for lowering the grate and allowing a rearward and upward movement of the same for the protection of the hands of the operator.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses;

MAX ROCKSTROH;

. lVitnessesz PAUL ARRAS, WALTER STADELMANN.

this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. c. 

